HINT: PRINT THIS PAGE AND TAKE OUT TO CAR! Simplest way to do it is: Fisrt drain all the coolant by undoing bottom hose if it's old. If it's nearly 12 mths or more it's old! If coolant is fresh you are going to lose some by just going to the next step. Undo the two nuts holding the thermostat cover on, remove cover and engine lifting eye. Remove thermostat from inside the opening.(Observing which way is UP) Replace thermostat AND the sealing ring with NEW parts (especially the seal). Refit nuts, DO NOT OVERTIGHTEN! Refill correct Coolant mix (50% Ethylene Glycol)through the reservoir. Start engine with reservoir cap OFF,top up with coolant as level drops, but DO NOT overfill!.... run until Temp guage is at normal and NO air bubbles are visible, then replace cap. Check for any leaks under pressure when hot and recheck for correct Coolant level. Recheck levels before and after next drive. Then it should remain constant.
I'm not 100% sure, but I would expect Volvo to keep them located in the same location and that would be in the Thermostat Housing. The part you would be looking for on your engine (where the thermostat is) would be screwed into it and have wires coming off it. This would be your Temp-sensor and is inexpensive to buy and easy to replace. Go to your local parts store to get.
Typically on the top of the engine block or just where the top radiator hose connects to the engine block. on the Volvo 840 the thermostat comes with a rubber seal, the housing requires NO CLEANING other then BEFORE dismantling the housing. simply drop the new thermostat in place with the little pressure bleed valve to the fron of the engine housing, replace the housing. again NO SEALant IS REQUIRED AS THE SEAL DOES THE TOTAL JOB. takes about 10 minutes if you give the job to a chimp, 5 if you do it yourself
Found the wiring diagram for where the colored wires go to connect to the bulb connectors, so I'm thinking my wiring to replace the circuit board is not correct. This is a 1987 Volvo 240dl. Can anyone offer any assistance? I tried following the circuit board as to where to place the wires, but it cannot be correct. If anyone has hard wired theirs, please advise.
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